Import Errors

Here is a shot of my feature tree for an STEP Assembly that i mported this morning. i can not run Import Diag's as all the advice online point to it, it is greyed out in my command search and does not appear with a right click on the erroed component. Any ideas on how to fix these issues?

I've never opened a step assembly, but I'll take a shot at this. Looks like you have component bodies you can open up. Can you open the individual bodies of the assembly, and run import diagnostics on each individual file?